Just had a quick question regarding payment. When I go to create my acct, and enter in the code for the free 15-days, it asks for my credit card information and says it's $12.99/mo + first 15 days free.

When I try to click on the Billing and Subscription FAQ, it gives me an error, so I can't read the FAQ. I was just wondering, if they bill you at all during the first 15 days, and if not, how easy it is to cancel an acct.

They don't bill ya until the 15th or 16th day of the trial
It's dead easy to cancel a trial account to, you do it via the account management page

No they will not bill you only verify that you have a legitimate bank acct...easy to cancel , just as soon as you subscribe go to subscription page and click cancel subscription. you will be given the option of cancelling immediately or at the end of your billing cycle. since the free 15 days is the end of your cycle you can hit that option and in case you forget you wont get billed.